#!/bin/sh
#
# Copyright (C) 2012-2013, 2016, 2018, 2019, 2022  Etersoft
# Copyright (C) 2012-2013, 2016, 2018, 2019, 2022  Vitaly Lipatov <lav@etersoft.ru>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#

load_helper epm-query
load_helper epm-print

__epm_filter_out_base_alt_reqs()
{
    grep -E -v "(^rpmlib\(|^/bin/sh|^/bin/bash|^rtld\(GNU_HASH\)|ld-linux)"
}

__epm_alt_rpm_requires()
{
    if [ -n "$short" ] ; then
        # TODO see also rpmreqs from etersoft-build-utils
        docmd rpm -q --requires "$@" | __epm_filter_out_base_alt_reqs | sed -e "s| .*||"
    else
        docmd rpm -q --requires "$@" | __epm_filter_out_base_alt_reqs
    fi
}

get_linked_shared_libs()
{
    assure_exists readelf binutils
    #is_command readelf || fatal "Can't get required shared library: readelf is missed. Try install binutils package."
    #ldd "$exe" | sed -e 's|[[:space:]]*||' | grep "^lib.*[[:space:]]=>[[:space:]]\(/usr/lib\|/lib\)" | sed -e 's|[[:space:]].*||'
    LC_ALL=C readelf -d "$1" | grep "(NEEDED)" | grep "Shared library:" | sed -e 's|.*Shared library: \[||' -e 's|\]$||' | grep "^lib"
}

__epm_elf32_requires()
{
    get_linked_shared_libs "$1"
}

__epm_elf64_requires()
{
    get_linked_shared_libs "$1" | sed -e 's|$|()(64bit)|'
}

__epm_elf_requires()
{
    local i
    if [ -n "$direct" ] ; then
        for i in $* ; do
            get_linked_shared_libs $i
        done
        return
    fi

    for i in $* ; do
        if file "$i" | grep -q " ELF 32-bit " ; then
            __epm_elf32_requires "$i"
        elif file "$i" | grep -q " ELF 64-bit " ; then
            __epm_elf64_requires "$i"
        else
            warning "Unknown ELF binary"
        fi
    done
}

epm_requires_files()
{
    local pkg_files="$*"
    [ -n "$pkg_files" ] || return

    # TODO: handle separately
    local PKGTYPE="$(get_package_type $pkg_files)"

    case "$PKGTYPE" in
        rpm)
            assure_exists rpm >/dev/null
            __epm_alt_rpm_requires -p $pkg_files
            ;;
        deb)
            assure_exists dpkg >/dev/null
            a='' docmd dpkg -I $pkg_files | grep "^ *Depends:" | sed "s|^ *Depends:||g"
            ;;
        eopkg)
            showcmd eopkg info $pkg_files
            LC_ALL=C eopkg info $pkg_files | grep "^Dependencies" | head -n1 | sed -e "s|Dependencies[[:space:]]*: ||"
            ;;
        ELF)
            __epm_elf_requires $pkg_files
            ;;
        *)
            fatal "Have no suitable command for $PKGTYPE"
            ;;
    esac
}

epm_requires_names()
{
    local pkg_names="$*"
    local CMD
    [ -n "$pkg_names" ] || return

# by package name
case $PMTYPE in
    apt-rpm)
        # FIXME: need fix for a few names case
        # FIXME: too low level of requires name (libSOME.so)
        if is_installed $pkg_names ; then
            assure_exists rpm >/dev/null
            __epm_alt_rpm_requires $pkg_names
            return
        else
            if [ -n "$verbose" ] ; then
                CMD="apt-cache depends"
            else
                if [ -n "$short" ] ; then
                    LC_ALL=C docmd apt-cache depends $pkg_names | grep "Depends:" | sed -e 's|, |\n|g' -e "s|.*Depends: ||" -e "s|<\(.*\)>|\1|" | __epm_filter_out_base_alt_reqs | sed -e "s| .*||"
                else
                    LC_ALL=C docmd apt-cache depends $pkg_names | grep "Depends:" | sed -e 's|, |\n|g' -e "s|.*Depends: ||" -e "s|<\(.*\)>|\1|" | __epm_filter_out_base_alt_reqs
                fi
                return
            fi
        fi
        ;;
    packagekit)
        CMD="pkcon required-by"
        ;;
    #zypper-rpm)
    #    # FIXME: use hi level commands
    #    CMD="rpm -q --requires"
    #    ;;
    urpm-rpm)
        CMD="urpmq --requires"
        ;;
    yum-rpm)
        if is_installed $pkg_names ; then
            CMD="rpm -q --requires"
        else
            CMD="yum deplist"
        fi
        ;;
    dnf-rpm)
        if is_installed $pkg_names ; then
            CMD="rpm -q --requires"
        else
            CMD="dnf repoquery --requires"
        fi
        ;;
    pacman)
        CMD="pactree"
        ;;
    apt-dpkg|aptitude-dpkg)
        # FIXME: need fix for a few names case
        if is_installed $pkg_names ; then
            showcmd dpkg -s $pkg_names
            a='' dpkg -s $pkg_names | grep "^Depends:" | sed "s|^Depends:||g"
            return
        else
            CMD="apt-cache depends"
        fi
        ;;
    emerge)
        assure_exists equery
        CMD="equery depgraph"
        ;;
    homebrew)
        #docmd brew info $pkg_names | grep "^Required: " | sed -s "|s|^Requires: ||"
        docmd brew deps $pkg_names
        return
        ;;
    pkgng)
        #CMD="pkg rquery '%dn-%dv'"
        CMD="pkg info -d"
        ;;
    opkg)
        CMD="opkg depends"
        ;;
    eopkg)
        showcmd eopkg info $pkg_names
        LC_ALL=C eopkg info $pkg_names | grep "^Dependencies" | sed -e "s|Dependencies[[:space:]]*: ||"
        return
        ;;
    xbps)
        CMD="xbps-query -x"
        ;;
    aptcyg)
        #CMD="apt-cyg depends"
        # print show version
        docmd apt-cyg show $pkg_names | grep "^requires: " | sed "s|^requires: ||g"
        return
        ;;
    *)
        fatal "Have no suitable command for $PMTYPE"
        ;;
esac


docmd $CMD $pkg_names

}

epm_requires()
{
    # if possible, it will put pkg_urls into pkg_files or pkg_names
    if [ -n "$pkg_urls" ] ; then
        load_helper epm-download
        __handle_pkg_urls_to_checking
    fi

    [ -n "$pkg_filenames" ] || fatal "Requires: package name is missed"

    epm_requires_files $pkg_files
    # shellcheck disable=SC2046
    epm_requires_names $(print_name $pkg_names)
}
